STM32F407ZGT6 串口空闲中断代码

下面是一个基于STM32F407ZGT6的串口空闲中断代码示例：

#include "stm32f4xx.h"
#include "stdio.h"

#define USARTx                           USART1
#define USARTx_CLK                       RCC_APB2Periph_USART1
#define USARTx_IRQn                      USART1_IRQn
#define USARTx_IRQHandler                USART1_IRQHandler

#define USARTx_TX_PIN                    GPIO_Pin_9
#define USARTx_TX_GPIO_PORT              GPIOA
#define USARTx_TX_GPIO_CLK               RCC_AHB1Periph_GPIOA
#define USARTx_TX_SOURCE                 GPIO_PinSource9
#define USARTx_TX_AF                     GPIO_AF_USART1

#define USARTx_RX_PIN                    GPIO_Pin_10
#define USARTx_RX_GPIO_PORT              GPIOA
#define USARTx_RX_GPIO_CLK               RCC_AHB1Periph_GPIOA
#define USARTx_RX_SOURCE                 GPIO_PinSource10
#define USARTx_RX_AF                     GPIO_AF_USART1

#define BUFFER_SIZE                      100

/* Global variables */
volatile uint8_t rx_buffer[BUFFER_SIZE];
volatile uint32_t rx_index = 0;
volatile uint8_t rx_data = 0;
volatile uint8_t rx_data_ready = 0;

/* Function prototypes */
void USART_Configuration(void);
void GPIO_Configuration(void);

int main(void)
{
  /* Initialize GPIO and USART */
  GPIO_Configuration();
  USART_Configuration();

  while (1)
  {
    if (rx_data_ready)
    {
      // 处理接收到的数据
      // ...
      
      // 清除标志位
      rx_data_ready = 0;
    }
  }
}

void USART_Configuration(void)
{
  USART_InitTypeDef USART_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;

  /* Enable GPIO clock */
  RCC_AHB1PeriphClockCmd(USARTx_TX_GPIO_CLK | USARTx_RX_GPIO_CLK, ENABLE);

  /* Enable USART clock */
  RCC_APB2PeriphClockCmd(USARTx_CLK, ENABLE);

  /* Connect USART pins to AF */
  GPIO_PinAFConfig(USARTx_TX_GPIO_PORT, USARTx_TX_SOURCE, USARTx_TX_AF);
  GPIO_PinAFConfig(USARTx_RX_GPIO_PORT, USARTx_RX_SOURCE, USARTx_RX_AF);

  /* Configure USART Tx and Rx as alternate function push-pull */
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;

  GPIO_InitStructure.GPIO_Pin = USARTx_TX_PIN;
  GPIO_Init(USARTx_TX_GPIO_PORT, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = USARTx_RX_PIN;
  GPIO_Init(USARTx_RX_GPIO_PORT, &GPIO_InitStructure);

  /* USART configuration */
  USART_InitStructure.USART_BaudRate = 115200;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

  USART_Init(USARTx, &USART_InitStructure);

  /* Configure and enable USART interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = USARTx_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  /* Enable USART */
  USART_Cmd(USARTx, ENABLE);

  /* Enable USART IDLE line detection interrupt */
  USART_ITConfig(USARTx, USART_IT_IDLE, ENABLE);
}

void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* Enable GPIO clock */
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

  /* Configure USART Rx as input floating */
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void USARTx_IRQHandler(void)
{
  if (USART_GetITStatus(USARTx, USART_IT_IDLE) != RESET)
  {
    /* Clear IDLE line detected interrupt flag */
    USART_ReceiveData(USARTx);

    /* Disable USART IDLE line detection interrupt */
    USART_ITConfig(USARTx, USART_IT_IDLE, DISABLE);

    /* Read received data */
    rx_data = rx_buffer[0];
    rx_data_ready = 1;
  }
}

这是一个基本的串口空闲中断代码示例，它使用USART1作为串口，并使用PA9和PA10作为串口的TX和RX引脚。在中断处理函数中，通过判断USART_IT_IDLE标志位来检测空闲中断，并将接收到的数据存储在rx_data变量中，然后在主循环中处理接收到的数据。

请注意，在使用此代码之前，确保已经正确配置了系统时钟和相应的GPIO引脚。还要根据需要修改波特率和其他串口配置参数。

希望对你有帮助！如有任何问题，请随时提问。